Right. I don't assign the hash. It happens inside Catalyst.
Looking at the source, it looks like it happens in Catalyst::Engine::prepare_uploads, which reads
sub prepare_uploads {
my ( $self, $c ) = @_;
my $request = $c->request;
return unless $request->_body;
my $uploads = $request->_body->upload;
my $parameters = $request->parameters;
foreach my $name (keys %$uploads) {
my $files = $uploads->{$name};
my @uploads;
for my $upload (ref $files eq 'ARRAY' ? @$files : ($files)) {
my $headers = HTTP::Headers->new( %{ $upload->{headers} }
+);
my $u = Catalyst::Request::Upload->new
(
size => $upload->{size},
type => $headers->content_type,
headers => $headers,
tempname => $upload->{tempname},
filename => $upload->{filename},
);
push @uploads, $u;
}
$request->uploads->{$name} = @uploads > 1 ? \@uploads : $uploa
+ds[0];
# support access to the filename as a normal param
my @filenames = map { $_->{filename} } @uploads;
# append, if there's already params with this name
if (exists $parameters->{$name}) {
if (ref $parameters->{$name} eq 'ARRAY') {
push @{ $parameters->{$name} }, @filenames;
}
else {
$parameters->{$name} = [ $parameters->{$name}, @filena
+mes ];
}
}
else {
$parameters->{$name} = @filenames > 1 ? \@filenames : $fil
+enames[0];
}
}
}
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